Update set-output command

[zricethezav]

From the nightly run: https://github.com/gitleaks/gitleaks-action/actions/runs/3247466866

gitleaks-action-HEAD
The set-output command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

cc @weineran

[weineran]

Also here: https://github.com/gitleaks/gitleaks-action/actions/runs/3229579925

But I am confused b/c I don't see us using set-output anywhere, do you? I also don't see it in the checkout action we're using. But maybe I'm just not looking in the right place...?

[ericcornelissen]

It looks like set-output is used in gitleaks.js#L124. Upgrading @actions/core to v1.10.0 should resolve the warning (see also the @actions/core release notes).

I submitted a Pull Request for this change.

[weineran]

Great find @ericcornelissen! We'll take a look at your PR. Thank you!

[weineran]

Resolved by #101